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A kind of nut · also called English walnut, Persian walnut, Common walnut

4 views: its portrait, and how it looks in the comparison photos.
About
Walnuts are edible, furrowed tree seeds that pack loosely, weighing about 3.7 ounces (106 g) per cup.
Shelled walnuts have a typical bulk density of 0.45 g/mL, making them lighter by volume than most other nuts. Their irregular, grooved shape prevents them from settling closely together, which leaves large air pockets in any measuring container. A standard quart container holds roughly 14.9 ounces (424 g) of walnut pieces. Because of their airy packing structure, a cup of walnuts weighs noticeably less than a cup of almonds, peanuts, or flour.
From Wikipedia
A walnut is the edible seed of any tree of the genus Juglans, most often the Persian or English walnut, Juglans regia. They are accessory fruit because the outer covering of the fruit is technically an involucre and thus not morphologically part of the carpel; this means it cannot be a drupe but is instead a drupe-like nut.
Read more on Wikipedia →Text from Wikipedia’s “Walnut” article, CC BY-SA 4.0.
3 on the site
One cup weighs
3.76 oz (106 g)
Quick answer
One US cup of shelled walnuts weighs about 3.7 ounces (106 g). This makes a full cup roughly as heavy as a standard deck of playing cards.
Typical figures, the same ones every comparison on the site uses; real ones vary.
More like shelled walnuts
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Next to anything: a person, a car, another nut.